fix(avastha): mark Shayanadi blocked when there is no sunrise instead of dropping the table

Polar day or night left determine_daytime without a sunrise, so the whole
avasthas module failed after the PVR activity formula was wired in. Only
the Shayanadi cell is blocked now; the other four states still compute
(BUG-1390).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HwMNZEzdzmrbPhuRNmZe3C

tests/test_avastha_full_reading_wiring.py

@@ -37,3 +37,29 @@ def test_full_reading_wires_hindu_sunrise_into_activity_formula(monkeypatch):
     assert actual['method_status'] == 'pvr_15_4_4_running_ghati'
     assert actual['components']['running_ghati'] == 43
     assert actual['state_index'] == 10
+
+
+def test_polar_birth_without_sunrise_keeps_other_avasthas(monkeypatch):
+    # BUG-1390：北极圈夏至没有日出。原来整个 avasthas 模块报错消失；现在只有姿态一项标无法计算。
+    repo = Path(__file__).resolve().parents[1]
+    monkeypatch.syspath_prepend(str(repo / 'scripts'))
+    tree = ast.parse((repo / 'scripts/jyotish_engine.py').read_text(encoding='utf-8'))
+    blocks = [node for node in ast.walk(tree) if isinstance(node, ast.Try)
+              and any(isinstance(item, ast.ImportFrom) and item.module == 'avastha_calculator'
+                      for item in node.body)]
+    report = {'modules': {}, 'errors': []}
+    env = dict(
+        report=report,
+        args=SimpleNamespace(lat=69.65, lon=18.96, tz=2),
+        asc_deg=0,
+        planet_lons={'Sun': 90, 'Moon': 0},
+        planets={'Sun': {'degree': 90, 'degree_raw': 90, 'sign': 'Cancer', 'house': 4}},
+        _birth_datetime_from_args=lambda args: datetime(1990, 6, 21, 12, 0),
+    )
+    exec(compile(ast.Module(body=blocks, type_ignores=[]), '<avastha-polar>', 'exec'), env)
+    assert report['errors'] == []
+    sun = report['modules']['avasthas']['Sun']
+    assert sun['avasthas']['Shayanadi']['state'] is None
+    assert sun['avasthas']['Shayanadi']['method_status'] == 'blocked'
+    assert sun['avasthas']['Deeptadi']['state']
+    assert '无法计算' in sun['interpretation']